Stock Photo - An employee of DHD Heliservice GmbH puts a filler neck into a canister after filling up the external tanks of a helicopter with the insecticide 'Dipel Es' against Oak Processionaries near Potsdam, Germany, 13 May 2013. Prussian Palaces and Gardens Foundation Berlin-Brandenburg (SPSG) announced that all oaks in the park will be treated with the insecticide 'Dipel Es' from the air and from the ground. Photo: Marc Tirl | usage worldwide. - Potsdam/Brandenburg/Germany

Stock Photo: An employee of DHD Heliservice GmbH puts a filler neck into a canister after filling up the external tanks of a helicopter with the insecticide 'Dipel Es'.

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